import hashlib
import json

class TrustPropagator:
    HEADER_SIZE = 80  # Bytes
    
    def generate_trust_digest(self, trust_scores: dict) -> bytes:
        """
        Create KB-scale Merkle root digest (Algorithm 1 Step 12)
        Args:
            trust_scores: {node_id: trust_value}
        Returns:
            80-byte compressed trust digest
        """
        data_hash = hashlib.sha256(json.dumps(trust_scores).encode()).digest()
        return data_hash[:self.HEADER_SIZE]
    
    def event_triggered_broadcast(self, trust_digest: bytes, threshold=0.05):
        """
        Trigger transmission only when trust deviation > threshold
        Args:
            trust_digest: Compressed trust data
            threshold: Deviation tolerance
        """
        # Implement edge device broadcasting logic
        pass
    
    def topological_analysis(self, graph):
        """Predict On-Off attacks using Grey Markov model (Sec 3.2.2)"""
        # Implement anomaly prediction based on network graph
        pass
